DIELECTRIC SPECTROMETRY OF AMORPHOUS THERMOPLASTIC GLASS BEAD COMPOSITES/

A series of polystyrene/glass bead and poly (styrene-co-methacrylic ac id)/glass bead composites with volumic fractions in the order of 21% i s studied by means of dielectric spectrometry. Experimental isochronal data on the pure matrixes show the alpha relaxation, associated to th e glass transition. In the case of the composites, a more intense rela xation appears at a higher temperature compared with that of the alpha relaxation. This relaxation is attributed to the Maxwell-Wagner-Silla rs (MWS) effect. Experimental results are in agreement with the van Be ek theory in the case of untreated spherical inclusions. This agreemen t is more remarkable in the case of coupling agent-treated glass beads .